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EnglishHenry’s law constant is an essential parameter for the estimation of the environmental prevalence of pollutants. Here, we present two improved methods for measuring Henry’s law constant deploying inert gas stripping (IGS). The methods are targeted at compounds with high gamma coefficients (activity coefficient at infinite dilution) corresponding to large infinite dilution coefficients, such as monoterpenes and sesquiterpenes. We deploy a highly sensitive PTR-MS (proton transfer reaction-mass spectrometer) (low limit of detection, wide linear range, split-second time resolution) as detector. We use suited off-equilibrium conditions to extrapolate to equilibrium conditions. The first method is based on the observed linear correlation between gas flow and off-equilibrium experimental Henry’s law constant value. The second method is based on the linear dependence of the gas holdup on volumetric flow. We report HLC constants for six monoterpenes, isoprene and even, as a proof of concept, the sesquiterpene farnesene. The new methods allow for measuring HLC of nearly insoluble compounds at a new accuracy and precision
Schuhfried, E.; Aprea, E.; Märk, T.D.; Biasioli, F. (2015). Refined measurements of Henry’s law constant of terpenes with inert gas stripping coupled with PTR-MS. WATER AIR AND SOIL POLLUTION, 226 (120). doi: 10.1007/s11270-015-2337-2 handle: http://hdl.handle.net/10449/25074
| Citation: | Schuhfried, E.; Aprea, E.; Märk, T.D.; Biasioli, F. (2015). Refined measurements of Henry’s law constant of terpenes with inert gas stripping coupled with PTR-MS. WATER AIR AND SOIL POLLUTION, 226 (120). doi: 10.1007/s11270-015-2337-2 handle: http://hdl.handle.net/10449/25074 |
| Internal authors: | |
| Organization unit: | Food Quality and Nutrition Department # CRI_2011-JAN2016 |
| Authors: | Schuhfried, E.; Aprea, E.; Märk, T.D.; Biasioli, F. |
| Title: | Refined measurements of Henry’s law constant of terpenes with inert gas stripping coupled with PTR-MS |
| Journal: | WATER AIR AND SOIL POLLUTION |
| Issue Date: | 2015 |
| Scientific Disciplinary Area: | Settore CHIM/01 - Chimica Analitica |
| Keywords ENG: | Henry law constant Monoterpenes Farnesene Inert gas stripping Proton transfer reaction mass |
| Language: | English |
| IF: | With Impact Factor ISI |
| Publication status: | Published |
| Nature of content: | Articolo in rivista/Article |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/s11270-015-2337-2 |
| Appears in Collections: | 01 - Journal article |
Files in This Item:
| File | Description | Type | License | |
|---|---|---|---|---|
| Schuhfried et al water air soil pollut 2015 226 120.pdf | N/A | Tutti i diritti riservati (All rights reserved) | Embargo Request a copy |
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